LOCATION TROXEL IL+IN WI

Established Series
Rev. BWR-KCH-JAD
05/2016

TROXEL SERIES

The Troxel series consists of very deep, well drained soils formed in silty colluvium and in the underlying loamy drift. They are in slight depressions on outwash plains, stream terraces, and till plains. Slope ranges from 0 to 4 percent. Mean annual precipitation is 914 mm (36 inches), and mean annual air temperature is 8 degrees C (48 degrees F).

TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Pachic Argiudolls

TYPICAL PEDON: Troxel silt loam - in a cultivated field at an elevation of about 261 m (855 feet) above mean sea level. (Colors are for moist soil unless otherwise stated.)

Ap--0 to 20 cm (0 to 8 inches); black (10YR 2/1) silt loam, dark grayish brown (10YR 4/2) dry; weak very fine granular structure; friable; many very fine roots; slightly acid; abrupt smooth boundary.

A1--20 to 36 cm (8 to 14 inches); black (10YR 2/1) silt loam, dark grayish brown (10YR 4/2) dry; moderate fine granular structure; friable; many very fine roots; slightly acid; abrupt smooth boundary.

A2--36 to 69 cm (14 to 27 inches); black (N 2.5/) silt loam, dark grayish brown (10YR 4/2) dry; moderate fine granular structure; friable; common very fine roots; moderately acid; clear smooth boundary.

A3--69 to 84 cm (27 to 33 inches); very dark brown (10YR 2/2) silt loam, grayish brown (10YR 5/2) dry; moderate very fine granular structure; friable; common very fine roots; moderately acid; clear smooth boundary. [Combined thickness of the A horizon ranges from 51 to 102 cm (20 to 40 inches).]

BA--84 to 99 cm (33 to 39 inches); brown (10YR 4/3) silt loam; moderate very fine subangular blocky structure; friable; common very fine roots; common distinct very dark grayish brown (10YR 3/2) organic coatings on faces of peds; moderately acid; clear smooth boundary. [0 to 25 cm (0 to 10 inches) thick]

Bt1--99 to 140 cm (39 to 55 inches); brown (10YR 4/3) silty clay loam; moderate fine and medium subangular blocky structure; firm; few very fine roots; common distinct dark brown (10YR 3/3) clay films on faces of peds; common sand grains; moderately acid; clear smooth boundary. [13 to 51 cm (5 to 20 inches) thick]

2Bt2--140 to 152 cm (55 to 60 inches); 60 percent brown (10YR 4/3) and 40 percent dark yellowish brown (10YR 4/4) clay loam; moderate medium subangular blocky structure; firm; few very fine roots; common distinct dark brown (10YR 3/3) clay films on faces of peds; 5 percent gravel; moderately acid; clear smooth boundary.

2Bt3--152 to 170 cm (60 to 67 inches); brown (10YR 4/3) gravelly sandy loam; weak medium subangular blocky structure; friable; common distinct dark brown (10YR 3/3) clay films on faces of peds; 17 percent gravel; slightly acid; clear smooth boundary.

2Bt4--170 to 191 cm (67 to 75 inches); dark yellowish brown (10YR 4/4) stratified loamy sand and sandy loam; weak coarse subangular blocky structure; very friable; few distinct brown (10YR 4/3) clay films on faces of peds and in pores; 8 percent gravel; slightly acid; abrupt smooth boundary.

2Bt5--191 to 201 cm (75 to 79 inches); 55 percent dark yellowish brown (10YR 4/4) and 45 percent brown (10YR 4/3) clay loam; weak medium angular blocky structure; firm; few distinct dark brown (10YR 3/3) clay films on faces of peds and in pores; 10 percent gravel; slightly acid; abrupt smooth boundary. [Combined thickness of the 2Bt horizon is 30 cm to several meters (12 inches to several feet).]

2BC--201 to 259 cm (79 to 102 inches); 55 percent dark brown (7.5YR 3/2) and 45 percent brown (7.5YR 4/2) gravelly sandy clay loam; weak coarse angular blocky structure; friable; 18 percent gravel; slightly alkaline. [0 to 76 cm (0 to 30 inches) thick]

TYPE LOCATION: McHenry County, Illinois; approximately 3.2 km (2 miles) southwest of Woodstock, Illinois; 50 m (165 feet) south and 640 m (2,100 feet) west from the northeast corner of sec. 14, T. 44 N., R. 6 E.; USGS Woodstock topographic quadrangle; lat. 42 degrees 17 minutes 53 seconds N. and long. 88 degrees 29 minutes 59 seconds W., NAD 27; UTM Zone 16, 376369 easting and 4683962 northing, NAD 83.

RANGE IN CHARACTERISTICS: The depth to the base of soil development ranges from 1.5 to over 3 m (5 to over 10 feet ). The series control section ranges from moderately acid to neutral in most parts, but some pedons are slightly alkaline in the lower part. The mollic epipedon ranges from 51 to 114 cm (20 to 45 inches) in thickness.

The Ap, A, and/or AB horizon has hue of 10YR, 2.5Y or is neutral, value of 2 to 3, and chroma of 0 to 3. It is silt loam or silty clay loam in texture. Some pedons have an AB horizon rather than a BA horizon.

The Bt and/or BA horizon has hue of 10YR, value of 3 to 5, and chroma of 3 to 6. It is silt loam or silty clay loam.

The 2Bt and/or 2BC horizon has hue of 7.5YR or 10YR, value of 3 through 5, and chroma of 2 through 6. It is clay loam, loam, sandy clay loam, or the gravelly analogs of these textures. Strata of coarser textures are sometimes present. Commonly a darker colored, clay enriched subhorizon is present. Rock fragment content ranges from 0 to 20 percent.

COMPETING SERIES: These are the Barremills, Cotter, Reading, and Wiota series. Barremills soils have redoximorphic features and saturation in the lower part of the series control section. Cotter and Reading soils are in warmer climates with a mean annual temperature of more than 12 degrees C (53 degrees F). Wiota soils have a sand content of less than 15 percent in the lower third of the series control section.

GEOGRAPHIC SETTING: Troxel soils are in depressions on outwash plains, stream terraces, and till plains. The Troxel soils formed in 91 to 152 cm (3 to 5 feet) of silty material and in the underlying loamy drift. Mean annual air temperature ranges from 7 to 12 degrees C (45 to 53 degrees F), mean annual precipitation ranges from 737 to 1016 mm (29 to 40 inches), frost-free period ranges from 140 to 180 days, and elevation ranges from 155 to 311 meters (510 to 1020 feet) above mean sea level.

GEOGRAPHICALLY ASSOCIATED SOILS: These are Plano, Elburn, Warsaw, Lorenzo, Wea, Ringwood, and Griswold soils that are on nearby level to sloping areas on the landform. These soils have mollic epipedons that are less than 51 cm (20 inches) thick.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained. The potential for surface runoff is negligible to low. Saturated hydraulic conductivity is moderately high or high (4.23 to 14.11 micrometers per second). Permeability is moderate.

USE AND VEGETATION: Most areas are cropped. Corn, soybeans, and small grain are the principal crops. Some areas are used for meadow. Native vegetation is prairie grasses.

DISTRIBUTION AND EXTENT: Northern Illinois and Indiana and southern Wisconsin. Extent is small in MLRAs 95B, 105, 98, 110, and 111.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana.

SERIES ESTABLISHED: Kendall County, Illinois, 1941.

REMARKS: Diagnostic horizons and features recognized in this pedon are: mollic epipedon - the zone from the surface of the soil to a depth of 84 cm (33 inches) (Ap, A1, A2, and A3 horizons); argillic horizon - the zone from approximately 99 to 201 cm (39 to 79 inches) (Bt1, 2Bt2, 2Bt3, 2Bt4, and 2Bt5 horizons); udic moisture regime.

National Cooperative Soil Survey
U.S.A.